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The Great Thunderegg Hunt

Apr. 19, 2025

Participate in the Rice Northwest Museum of Rocks & Minerals egg hunt and take home a thunderegg or a mystery mineral.

In addition to the hunt, the museum will have uncut and polished thundereggs for sale, thunderegg cutting, geode cracking, and more. This way you can still cut open a thunderegg even if you don’t find one in the hunt.

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Contact

26385 Northwest Groveland Drive
Rice Museum of Rocks & Minerals
Hillsboro, OR 97124